2'-O-Methylation maintains ribosome structural and translation integrity

Area of Science:

• Molecular Biology
• Structural Biology
• Genetics

Background:

• Eukaryotic ribosomes utilize 2 -O-methylation in approximately 2% of RNA nucleotides.
• This modification is conserved and believed to be crucial for translation regulation and maintenance.
• The precise functional impact of 2 -O-methylation on ribosome function and cellular processes remains incompletely understood.

Purpose of the Study:

• To investigate the functional consequences of native 2 -O-methylation loss in yeast ribosomes.
• To elucidate the structural and mechanistic basis for the role of 2 -O-methylation in ribosome integrity and cellular stress response.

Main Methods:

• Ribosome profiling
• Translation assays
• Proteomics
• High-resolution structural analyses (e.g., cryo-EM)
• Thermostability assays

Main Results:

• Loss of 2 -O-methylation disproportionately affects the translation of ribosomal protein transcripts.
• Hypomethylation alters codon usage and RNA structure recognition, leading to translation reprogramming.
• Hypomethylated ribosomes exhibit reduced thermostability and altered structures/conformations.
• Under stress, hypomethylated ribosomes show selective loss of downregulated proteins and misassembly.

Conclusions:

• 2 -O-methylation is essential for maintaining ribosome integrity and proper translation.
• Ribosome structure and function are dynamically regulated by RNA modifications like 2 -O-methylation.
• This modification plays a critical role in mediating cellular stress responses and maintaining cellular fitness.